Trying to figure out if my third member is original to my car. 4-69 428cj Metuchen car. Third member casting date is 8L21, The date on the metal id tag is 9b with the correct gear ratio stamped,,matching the Marti report. I assume that the id tag date is the assembly date of the carrier? Also if the Marti report states standard, does that refer to non locking? Thanks in advance.